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Table 1 Cervical mobility indicators to predict difficult laryngoscopy between the two groups of patients undergoing cervical spine surgery

From: Preoperative X-ray C2C6AR is applicable for prediction of difficult laryngoscopy in patients with cervical spondylosis

Items Easy laryngoscopy group
(n = 230)
Difficult laryngoscopy group
(n = 40)
Statistical Test P-values
BMI 25.1 ± 3.3 25.7 ± 2.5 t=-1.127 0.261
MMT (class I-II/class III-IV) 149(64.8)/81(35.2) 19(47.5)/21(52.5) χ2= 4.33 0.037
HMDn (cm) 5.4 ± 0.8 5.3 ± 0.9 t = 0.777 0.438
HMDe (cm) 6.6 ± 1.0 6.5 ± 0.8 t = 1.073 0.285
HMDR 1.21 (0.19) 1.22 (0.13) z=-0.382 0.703
C0C1Dn (mm) 6.7 ± 2.6 6.4 ± 3.1 t = 0.665 0.507
C0C1De (mm) 0.6 ± 0.3 0.5 ± 0.3 t = 1.249 0.213
C0C1DR 12.14 (10.29) 13.70 (10.10) z = 0.490 0.624
C1C2Dn (mm) 4.6 (2.5) 5.0 (4.3) z = 1.113 0.266
C1C2De (mm) 0.5 (0.3) 0.6 (0.3) z = 1.087 0.277
C1C2DR 8.88 (5.36) 8.96 (6.51) z = 0.259 0.796
C 2 C 6 An (°) 9.0 (12.0) 13.5 (10.9) z = 2.484 0.013
C2C6Ae (°) 16.7 (13.6) 17.6 (16.1) z=-0.572 0.568
C 2 C 6 AR 1.80 (2.25) 1.26 (0.56) z=-4.127 < 0.001
  1. BMI Body Mass Index; MMT modified Mallampati test; HMDn/e the distance between the hyoid bone and the tip of the chin in the neutral/ extension position; HMDR the ratio between HMDe and HMDn; C0C1Dn/e the distance between the occipital bone and the first cervical vertebra in the neutral/ extension position; C0C1DR the ratio between C0C1Dn and C0C1De; C1C2Dn/e the distance between first cervical vertebra and the second cervical vertebra in the neutral/ extension position; C1C2DR the ratio between C1C2Dn and C1C2De; C2C6An/e the angle between a line passing through the bottom of second cervical vertebra and a line passing through the bottom of sixth cervical vertebra in the neutral/ extension position; C2C6AR the ratio between C2C6Ae and C2C6An